6 PREFACE TO SECOND EDITION. 



loaned by Professor John Gifford, Figure 9 is from H. B. Ayres, 

 Figure 32 from W. H. Rau. By permission of Houghton, Mif- 

 flin & Co. the typical botanical figures of plates 14, 15, 21, 22, 

 23, 24, 26, 31, 35, 43, 45, 49, 55 and 63 have been redrawn from 

 the "Silva of North America." The typical, botanical figures of 

 plates i, 6, 7, 10, 20 and 25 are redrawn from "Baume und 

 Straucher des Waldes." Plate 52 is redrawn from Flora von 

 Deutschland, Oesterreich u. d. Schweiz. 



SAMUEL B. GREEN. 

 January 30, 1902. 



